Normally, only one Physique was available for a Source Energy being. But there were certain cases wherein they could awaken to other Physiques lying dormant in their bodies or at least, swap it out with something better. Still, that was a rare case that even the old Earth didn't have the luxury of having.
Imagine how strong someone can be if they possessed two earth-shattering Physique? Jumping realms to defeat an opponent would be easy with them and they're naturally invincible in their level.
Although my Companions and I were also able to accomplish the same feat, it's still not as exaggerated as jumping two or three realms. If a being with two Physique also walked the Path of a Weaponmaster, it might even be possible to jump an entire Rank!